Very good advice posted above, basically mirrors my thoughts. I'll be there 2nd week of March 2011, same dates as my 2010 trip.
In my opinion, the tips selected seem of much more importance than the leader/tippet itself. I use about 3'-5' straight 15lb Maxima Chameleon, or 16-20lb fluorocarbon, looped to a 20" butt section of 30lb Chameleon on the end of all my tips.
I found myself using 10-15' T-14 almost all week last year, even though the water was low and clear. Probably a bit more sink rate than necessary, but that's just how I prefer to fish for browns... on the bottom.
If you need any more info at all for your trip please don't hesitate to ask away.